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Method suitable for evaluating ultralow-frequency oscillation stability of power system

A power system, ultra-low frequency technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve problems such as the lack of ultra-low frequency oscillation evaluation methods

Active Publication Date: 2020-08-18
SICHUAN UNIV +1
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of the lack of an accurate evaluation method for ultra-low frequency oscillation in the prior art, and propose a method suitable for evaluating the stability of ultra-low frequency oscillation in power systems

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  • Method suitable for evaluating ultralow-frequency oscillation stability of power system
  • Method suitable for evaluating ultralow-frequency oscillation stability of power system
  • Method suitable for evaluating ultralow-frequency oscillation stability of power system

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Embodiment Construction

[0056] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the implementations shown and described in the drawings are only exemplary, intended to explain the principle and spirit of the present invention, rather than limit the scope of the present invention.

[0057] Embodiments of the present invention provide a method suitable for evaluating the stability of ultra-low frequency oscillations in power systems, such as figure 1 As shown, the following steps S1-S11 are included:

[0058] S1. Extract the initial operating parameters of the generator in the stand-alone system with load.

[0059] In the embodiment of the present invention, the initial operating parameters of the generator include the generator terminal voltage U t , U t The d-axis component u td , U t q-axis u tq , d-axis component x of generator synchronous reactance d , The q-axis component x of the synchr...

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Abstract

The invention discloses a method suitable for evaluating the ultralow-frequency oscillation stability of a power system, which considers the actual operation scene of ultralow frequency oscillation ofthe current power system, and provides an improved analysis model based on a single-machine on-load system, which better conforms to the situation of an actual power grid. Meanwhile, the ultralow-frequency oscillation stability judgment index provided by the invention comprehensively considers the damping provided by the generator, the excitation system and the prime motor speed regulator for theultralow-frequency oscillation, and finally the ultralow-frequency oscillation stability evaluation method provided by the invention can more accurately evaluate the damping level and the ultra-low frequency oscillation stability of the system.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to the design of a method suitable for evaluating the stability of ultra-low frequency oscillations in power systems. Background technique [0002] Ultra-low frequency oscillation is a new type of stability problem that has emerged in power systems in recent years, which is different from traditional low-frequency oscillations, and most of them appear in hydropower-based power grids. This problem has appeared many times in domestic actual power grid operation tests. Oscillation characteristics are different from low frequency oscillations. [0003] At present, the oscillation frequency of the low-frequency oscillation that has been studied more is mostly in the range of 0.1-2.5Hz. The main reason is that the system is caused by the negative damping effect of the generator and the excitation system, and most of them are relative oscillations between rotors, which be...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/241H02J2203/20
Inventor 刘天琪江琴李保宏陈刚
Owner SICHUAN UNIV
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